Well like many of those out there driving around 10 year old Caddies, my new-to-me, 1993 STS had 4 blown shocks.
Not wanting to pay the $900CAN each for all 4 plus install, I bought a set of passive replacement struts from
http://www.strutmasters.com
Picked up all 4 for $500US or $800CAN after taxes and duty.
I bought them from strutmasters because GM does not have passive replacement shocks for the rer of the STS, only the fronts.
I had them installed today after driving for about 1 month with the blown setup. I would have done the install myself, but it is too cold out right now where I am, and I don't like spending 7 hours of my day to replaces 4 shocks.
The shocks have been installed and my ride is much, much nicer. The car now corners with confidence, doesn't bottom out and get all jittery over bumps. Sit at the right ride height.
Basically, if you have a problem with the active struts, the Strutmaster replacements are a perfect replacement shock. Installation can be difficult (rust and the air bag suspension make a torch nearly a necessity) but nothing the do it yourselfer can't do. I just chose not to.